Once the meaning had transferred from the substance to the shape, piggy banks began to be made from other substances, including glass, plaster, and plastic.

In a curious case of parallel evolution, the Indonesian term celengan (a celeng is a wild boar, with the "an" affix used to denote a likeness) was also used in the context of domestic banks. The etymology of the word is obscure, but evident in a Majapahit piggy bank from the 15 century A.D.